upvoted.top:Shake Flashlight

Shake Flashlight


The Forever Compact 7″ Flashlight uses no batteries or bulbs. Instead it uses Faraday’s Principle of Magnetic Induction and a bright LED to produce light without batteries. The flashlight is shaken for about 30 seconds to recharge a capacitor and it will then provide about 5-7 minutes of light. How does this happen? As the flashlight is shaken, a magnet passes through a metal coil which, when you shake, “induces” voltage in the coil generating electricity. During prolonged use it can be shake…

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If batteries could be charged from the friction of scrolling, our phones would never die.(r/Showerthoughts)

I think you vastly overestimate the amount of energy generated thru friction. Even if you harnessed all of it, the charge would be negligible.

A better idea would be to capture the energy from jostling/shaking your phone. It’s still small, but they do make flashlights that work this way: www.amazon.com/Forever-Light-Shake-Flashlight/dp/B…

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